MAX5003-50WEVKIT Maxim Integrated Products, MAX5003-50WEVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5003-50WEVKIT
• Description: MAX5003-50WEVKIT Evaluation Kit For The MAX5003-50W
• Manufacturer: Maxim Integrated Products

Figure 1. Efficiency vs. Output Power
Figure 2. Output Voltage Regulation vs. Output Current
Key performance characteristics of the power supply
include efficiency and output voltage regulation. Figure 1
shows the efficiency vs. output power. The efficiency
reaches 85% at about 25W of output power and stays
relatively flat up to 50W. Even though the efficiency is
very high, heatsinking is required for the power MOSFET
and output diode. The diode will dissipate about 6W with
a 10A output current and the MOSFET can be expected
to dissipate about 3W to 4W at full 50W load. Sufficient
airflow over the power supply is recommended to cool
down the power transformer and output inductor.
Figure 2 shows the output voltage regulation of the
power supply from 0 to 10A of output current. Voltage
measurement was done across the output voltage
sense points +V
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
90
80
70
60
50
40
30
20
10
Power-Supply Performance
0
0
0
O
and -V
_______________________________________________________________________________________
10
2
OUTPUT POWER (W)
O
20
4
.
I
OUT
(A)
30
6
40
8
50
10
MAX5003-50W Evaluation Kit
Another interesting performance waveform for power
supplies is the output voltage transient response to a
step change in output current. Figure 3 shows load
transient response when the load is stepped from 10A
to 0.8A.
As can be seen from Figure 3, the initial transient
response time is less than 30µs. This is a side benefit of
using an optocoupler in conjunction with a TL431 shunt
regulator for isolation.
Figure 4 shows the well-behaved startup characteristics
of this power supply, which are characterized by the
monotonic rise of the output voltage as well as the
absence of any overshoots at the end of the rise period.
Figure 3. Output Transient Response (I
Figure 4. Output Voltage Transient At Power-Up
(V
IN
= 48V, I
-0.05
-0.10
-0.15
0.25
0.20
0.15
0.10
0.05
1V/div
OUT
0
= 5A)
10µs/div
2ms/div
OUT
: 10A to 0.8A)
MAX5003 fig04
3